https://tbpl.mozilla.org/php/getParsedLog.php?id=6274862&full=1 d:/mozilla-build/python25/python2.5.exe -O e:/builds/moz2_slave/m-cen-w32/build/js/src/build/cl.py cl -Fojscompartment.obj -c -DOSTYPE=\"WINNT5.2\" -DOSARCH=WINNT -DEXPORT_JS_API -DIMPL_MFBT -DJS_HAS_CTYPES -DDLL_PREFIX=\"\" -DDLL_SUFFIX=\".dll\" -Ictypes/libffi/include -I. -I/e/builds/moz2_slave/m-cen-w32/build/js/src -I. -I./../../dist/include -I./../../dist/include/nsprpub -Ie:/builds/moz2_slave/m-cen-w32/build/obj-firefox/dist/include/nspr -I/e/builds/moz2_slave/m-cen-w32/build/js/src -I/e/builds/moz2_slave/m-cen-w32/build/js/src/assembler -I/e/builds/moz2_slave/m-cen-w32/build/js/src/yarr -GR- -TP -nologo -wd4345 -D_CRT_SECURE_NO_WARNINGS -W3 -Gy -Fdgenerated.pdb -wd4244 -wd4800 -we4553 -DNDEBUG -DTRIMMED -Zi -Zi -UDEBUG -DNDEBUG -O2 -Oy -DUSE_SYSTEM_MALLOC=1 -DENABLE_ASSEMBLER=1 -DENABLE_JIT=1 -MD -FI ./js-confdefs.h -DMOZILLA_CLIENT /e/builds/moz2_slave/m-cen-w32/build/js/src/jscompartment.cpp jscompartment.cpp e:\builds\moz2_slave\m-cen-w32\build\js\src\methodjit/MethodJIT.h(690) : warning C4305: 'argument' : truncation from 'js::MaybeConstruct' to 'bool' e:\builds\moz2_slave\m-cen-w32\build\js\src\methodjit\BaseAssembler.h(1282) : warning C4146: unary minus operator applied to unsigned type, result still unsigned e:\builds\moz2_slave\m-cen-w32\build\js\src\methodjit\BaseAssembler.h(1283) : warning C4146: unary minus operator applied to unsigned type, result still unsigned e:\builds\moz2_slave\m-cen-w32\build\js\src\methodjit\BaseAssembler.h(1287) : warning C4146: unary minus operator applied to unsigned type, result still unsigned

This is by bug 677006.